If you are sure that a sample of material is aluminum but have no measuring instruments and are not allowed to handle the sample, how would you determine the sample’s density?

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion